ANTOnline via eBay offers the HP Officejet Pro X Inkjet Printer, model no. X451DN, for $149.99 with free shipping. That's the lowest total price we could find by $48. It features duplex printing, up to 55 ppm in black, up to 55 ppm in color, USB, 2400x1200 dpi, and a 550-page sheet tray.
Update: Specs corrected.